Krxlion

This topic was raised due to our recent discussion with @Daniel-99 and @FriedlS, thus can be used to discuss ways of implementing brushless motors to our lego technic creations. We may also speak about other modifications that surely comes with implementing brushless motors like transmitters, receivers, ESCs, ball bearings, printed parts, etc. To start of, I want to get everyone a picture what we need to power our models with brushless motors: Brushless motor - for example A2212 1000KV 2-3s (A2212 - meaning model type and dimensions, 1000KV - how many turns does motor make when we power it with 1 volt , 2-3s - which type of battery does motor support). Transmitter - for example DumboRC X6FG (good starting transmitter that often comes with suitable receiver, which supports gyro function - it helps the model go in straight line using countersteering). Receiver - like mentioned above. ESC - heart of brushless setup. Think of it as lego technic hub that you connect all motors and receiver to it. The ESC must be bidirectional, usually for mentioned above motor 30-35A should be enough. You may go with SurpassHobby 35A ESC. Servomotor - GeekServo, simple, does it job and is easy to implement in lego models due to pin holes in it. Battery - usually we can choose between 2s and 3s. Second option is more powerful but often simply bigger. My choose was GensAce LiPo 1800mAh 3s 11.1V 45C, but I find it now too big. Battery charger - for example iMAXrc B3. It is cheap and simply does the job, but you can get a better one, suited exactly to your battery capacity and number of cells. If you have any doubts what to choose or how to start, feel free to ask, that is especially the case why this topic was raised. There are some things that you need pay attention one, like matching connection plugs of your ESC and battery, how to transfer RPMs from motor's shaft to lego gears, how do you plan to hold your motor in lego model (usually screw the motor to the liftarm using M2 or M3 bolts). Just to not leave this topic without any questions or discussion I want to ask mentioned above guys few more things: 1. @FriedlS you mentioned one of previous posts that you are using carbon axles, may I ask where do they come from? 2. @Daniel-99 are those housing of A2212 brushless motors are available as printable files so I can try to print them on my own? 3. Do you guys know what other cool brushless motors we may use in our setups? 4. @FriedlS do you know the dimensions of those ball bearings that you've been using in your recent model? Maybe we can fit them in technic liftarms or frames if we would additionally drill slightly bigger holes in them?

Many thanks Daniel! I must say your list regarding gears problems is interesting, I will keep it in mind. I started lubricating lego gears but due to high rpm of my current brushless motor the lubricant simply go away few seconds after revving the engine. :D I have watched the video with some subtitles and ordered right away the A2212 1000KV just to have it in stock for future MOCs or to replace the current one :) The casing showed in the video is marvelous, I believe it would not have a problem with escaping lubricant like I have due to closed case. All in all I am aiming at something that @FriedlS created, baja truck but in a bigger scale, something 1:10 or 1:12, 10-15km/h speed and decent climbing ability (35-45 degree angle). Maybe if you are interested I could film my current model and upload it in a new post, so you could help me with solving my issues. In the end I want to use as less as possible non-lego parts. My initial thoughts was to create a MOC that is simply delivered with more power. I bought two BW 3.0 in the past 1-2 years but even implementing those two in a single model is not enough if you use BW Motors or Buggy motors, shutdown, bluetooth lag, etc.

Hi guys, For the last few months I've been trying to implement brushless motors into our bricks. I have a few questions and if you would answer them I will appreciate that a lot! :) 1. I am struggling with melting axles, this is probably because of high RPM motor. I am using 2838 bl motor, 4500kv right now and if I would choose different one, do you recommend A2212 1000KV for lets say 1-1,5kg models or should I go with different one? 2. What pinion gear are you using to match lego gears? I am using 10T Bullet Flux Pinion but I find it just slightly to small, it rotates with for example 20T lego gear and there is small space between those two gears. Just to sum it up, I am using DumboRC 6r with gyro receiver, I have 35A ESC and one geek-servo. Currently I am working on baja truck, actually I have one now but during some recent tests I still believe this model is not yet ready to be showed on forum. :) PS Daniel, your model is great I am looking always forward to see more of your models since you release Dragonfly! :)

Great model not gonna lie :) I really like the gearbox and I suddenly found out that I know you from the rebrickable page (I am new to eurobricks) and I actually bought one of your instructions from rebrickable (zetros C-model with gearbox 3:1). :D